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The atmosphere of Earth, commonly known as air, is the layer of gases retained by Earth's gravity that surrounds the planet and forms its planetary atmosphereThe atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), andMain article The natural atmosphere is composed of 78% nitrogen, 21% oxygen, 09% argon, and only about 01% natural greenhouse gases Although a small amount, these greenhouse gases make a big difference they are the gases that allow the greenhouse effect to exist by trapping in some heat that would otherwise escape to spaceWater cycle diagram "A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range This process is the fundamental cause of the greenhouse effect The primary greenhouse gases in the Earth's at...